Drawing device for spinning frames and for preparing machinery



J. PFLIMLIN Mafch 4, 1930.

CHINERY V DRAWING DEVICE FOR SPINNING FRAMES AND FOR PREPARING MA FiledNov. 10, 1928 lf3-g2 Ey Egan,

INVENTOR 755535Z my BY /s' A RNEY Patented Mar. 4, 1 930 UNITED STATESJULES PFLIMLIN, OF MULHQUSE, FRANCE DRAWING DEVICE FORSPINNING FRAMES dAND FOR PREPARING- MACHINERY Application led November 10, 1928, SerialNo. 318,558, and in France and Great Britain May 29, -1928.

This invention relates to sliver or roving drawin devices devised forthe drawing effected y spinning frames and the like, as also bypreparatory machines and .for drawing frames. More particularly itrelates to an improvement in the construction of the upper or floaterroller of the intermediate pair.

I have discovered that for the. greatest eiciency the loater rollershould be equipped with an elastic sleeve-like body having a sufficientthickness to provide a great resiliency and flexibility so that as aresult of its weight (and supplementary weight if necessar it is readilydeformed so as to conform to tide surface of the lower roller of theintermediate pair, the compressibility being in Such degreethat thelower roller is embraced u on a comparatively large pai-tof its circumerential surface.

My present invention is particularly concerned with improving theelastic sleeve or body member of the iioater roller especially whenmanufactured of rubber or like material. For perfect and durableelasticit pure Para rubber is the most suitable material but if used ina solid form its resilience is insufficient to meet the exigencies ofthemain drawing with the ordinary weighting. Excessive weighting, suicientto cause a solid rubber roll to embrace the lower intermediate roller tothe desired extent, is detrimental to the good quality of the yarn andthread.

Accordingly the object of my invention is to produce a body sleeve forfioater rollers of veryelastic material, for example pure ParaJ rubber,having a construction that will insure an elongated or belt-likeengagement of the sliver being drafted under usual weighting conditions.To the accomplishment of this object the resilient material of the bodysleeve comprises an inner wall or hub designed to fit on the usual metalspindle, and an outer wall or skin separated from the hub byintermediate spacing members constructed and arranged to provide 'hollowcompartments therebetween. The intermediate spacing members are in theform of longitudinal partitions preferabl but not necessarily, h aving aspiral relation to the hub providing for circular series of open cellsbetween the inner and outer walls of the sleeve. `The result is asleeve-'like cellular body of substantial thickness so readilycompressible that ordinary weighting will cause the floater roller, of5'5 which this resilient body is the main element,

to be deformed to such an extent as to cont'act with a relatively longarc of the surface of the lower roller.

The nature of my invention will best be understood from the followingdescription of the accompanying drawings, in which Figure 1 is across-sectional View of the preferred construction of the oater rollersleeve;

Figs. 2, 3 and 4 are cross-sectional views of modified forms of thefloater roller sleeve;

Fig. 5 is a view, in perspective, of the prefeied form of the sleeveillustrated by Fig. 1 an Fig. 6 illustrates, in longitudinalcrosssection, a pair of the sleeves mounted on the usual metal spindle.

Referring .iirst to Figs. 1 and 5 the sleeve is formed in a mould, themould being detions 11 are arranged symmetrically about the center ofthe sleeve and for sleeves from 20 mm. to 30 mm. in diameter six suchpartitions have been found suiicient in practice to maintain thecylindrical form while yet 'providing for the great suppleness andcompressibility that mustrcharacterize the oater rollers. VThe hollowcompartments or cells between the partitions have an outer width ofslightly less than one-sixth of the inner circumference of the outer'skin. Because of the circumferential overlapping of the ,partitions, dueto' their spiral arrangement, the

cells overlap each other radially and a neuthin connecting longitu- 80the hub and their outer edges being joined substantially tangentially 85vto the inner surface of the skin. The partitralizing and progressiveelastic support is given to the skin as the floater-roller' rotatesproviding for a uniform suppleness or compressibility throughout itscircumferential surface.

' This highly important characteristic of uniform compressibility at allpoints on the l circumference of the sleeve may be secured by otherarrangements of -the partitions. For example in Fig. 2 the hub 10 may bespaced' from the skin 12 by-two series of radial partitions 13 and 15extendingoutwardly from the hub and inwardly from the skin,respectively, both series being joined and supported by a centralcylindrical partition 14. lIn this example the radial partitions 13 and15 are staggered relatively to each other thereby lThis form is somewhatless supple and to compensate for the stiii'e-ning at local points onthe circumference resulting from the radial form of the partitions thesections 17 of the skin between each pair of partitions is made thickerthan at the areas of connection of said partitions with theskin. Thusthe depressibility of the elastic skin throughout its circumference isequalized.

the examples describedl in pure Para rubber 1 which provides theinherent elasticity revquired to cause the sleeve to resume itscylindrical form after the progressive depression of its circumferentialsurface during its rotation in ,weighted contact with the lowerintermediate roller. In practice theskin of ythe floater roller isdepressed from 1 mm.

to 11/2 mm. while-in contact with the 'lower intermediate roller thusspreading the contacting surface over a comparatively large part of thecircumferential surface `of thel lower roller and consequently extendingits control of the sliver passing through l said rollers over asubstantial distance in the direction of extent of the sliver. Thisbetter control of the sliver, by causing the fibres to be more evenlypayed out, prevents them from being drawn forward in variable quantityresulting in uniform evenness in the drawn sliver as delivered from therollers.

It will be understood by those'skille'd in the art that the rubbersleeve will be covered by a cot of some thin and fiexible leather, aspracticed in this art, to protect the rubber The material preferablyused for all of and to provide the iioater roller with a sur- I facebest suited to engagement with the sliver and to draft the same with thegreatest eiiiciency.

The nature and scope of my invention having been indicated, and itspreferred embodiments having been specifically described,

what is claimed as new, isz- 1. In drawing devices for spinning framesand preparing machinery, a sleeve for floater rollers formed of veryelastic material and comprising a hub portion and an outer skin, thearrangement hein such that the suppleness and compressibility of theioater is in- 'creased by providing hollow compartments between the huband theskin.

2. In drawing devices for spinning frames and preparing machinery, asleeve for floater rollers formed of very elastic material andcomprising a hub portion and an outer skin, the arrangement being suchthat the suppleness and compressibility of the ioater is increased byproviding hollow compartments between the huband the skin, together withmeans to maintain a substantially uniform compressibility about thewhole circumferroller.

3. In drawing devices forspinning frames and preparing machinery, asleeve for loaterv rollers formed of ver elastic material, comprising-atubular hu ,a tubular outer wall concentric with the hub, and connectlngpartitions between the hub and the outer wall, Y

said connecting. members, in transverse section, forming withl the huband the outer wall any geometrical design having a center of symmetry. v

4. A vdeformable sleeve for loater rollers comprising concentric tubularportions the inner of which forms ahub and the outer of which forms askin, said hub and skin being connected by longitudinally arrangedpartitions spaced apart to provide hollow compartments therebetween.'

5. A deformable sleeve for iioater rollers comprising two hollowcylinders differing in diameter, the smaller nested concentricallywithin the larger and being held in such position by longitudinalpartitionsextendmg from one cylinder t the other forming 1101-.

low compartments between them the relation of said partitions to eachother belng such that said compartments overlap each otherv radially.

v 6. A deformable sleeve for oater rollers comprising concentric tubularportions the inner of which forms a hub and the outer of -which forms askin, said hub and skin being connectedby longitudinal partitions thatare curved in a manner to connect tangentially with the hub and skinleaving hollowr compartments therebetween.

7 As an integral article of manufacture a rubber sleeve for iioaterrollers comprisence and throughout the length ofthe oater ing a hollowcylindrical hub, partitions about the hub lying parallel to the axis of'rotation but each curved in its own plane to present a spiralcross-section relative to said hub, and a cylindrical outer wallconnecting the outer edges of said partitions.

8. A deformable sleeve for floater rollers comprising concentric tubularportions ,the inner of which forms a hub and the outer of Which forms askin, said hub and lskin being connected by longitudinally arrangedpartitions spaced apart to provide hollow compartments therebetween, thewall of said skin being thicker between said partitions than at theareas of connection of said partitions with said skin. In testimonywhereof I signed hereunto my name. y

Y JULES PFLIMLIN.

